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Table 1. The CEUS LI-RADS categories
CEUS LR-NC Not Categorizable:
The observation that cannot be meaningfully categorized because image omission or degradation prevents the
assessment of one or more major features
CEUS LR-1 Definitely Benign:
100% certainty that the observation is not malignant
CEUS LR-2 Probably Benign:
High probability but not 100% certainty that the observation is not malignant
CEUS LR-3 Intermediate probability of malignancy:
Non-malignant and malignant entities each have a moderate probability
CEUS LR-4 Probably HCC:
High probability but not 100% certainty that the observation is HCC
CEUS LR-5 Definitely HCC:
100% certainty that the observation is HCC
CEUS LR-M Probably or definitely malignant, not HCC specific:
High probability or 100% certainty observation is malignant but features are not HCC specific
CEUS LR-TIV Tumor in vein:
100% certainty there is malignancy with tumor in vein

CEUS LI-RADS: Contrast-Enhanced Ultrasound Liver Reporting and Data System; HCC: hepatocellular carcinoma

Figure 1. The CEUS LI-RADS Algorithm and Diagnostic Table (reproduced with permission from the ACR). CEUS LI-RADS: Contrast-
Enhanced Ultrasound Liver Reporting and Data System; HCC: hepatocellular carcinoma; ACR: American College of Radiology